Monthly Notices of the Royal Astronomical Society · 1979 · 23 citations · 0 references
Natural SciencesAstronomyRadiation PhysicsSpectroscopyX-ray AstronomyHigh-energy Astrophysical SourcesOptical SpectroscopyX-ray Data AnalysisX-ray SpectroscopyBremsstrahlung RadiationCompton ScatteringOptical DepthSpectral CharacterizationThermal BremsstrahlungThermal X-ray EmissionX-ray Spectra
Comptonized thermal bremsstrahlung spectra have been fitted to data from Sco X-1, 4U 1702 – 36 (Sco X-2), 4U 1813 – 14 (GX 17 + 2) and 4U 1728 – 16 (GX 9 + 9). These spectral forms result in improved values of χ2 and give lower values of temperature when compared with pure bremsstrahlung spectra. We find an electron temperature for Sco X-1 of 2.4 keV (2.8 × 107 K). There is no evidence for the correlation of temperature with intensity, which has been reported by previous authors. Instead, we observe that the optical depth and intensity of Sco X-1 are correlated.